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  1. By: Nuttall, Clive Patrick - Cooper, John
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 23
    Date: 1973
    Page Range: 177--219
    Publication Info: London, BM(NH),
  2. By: Seddon, Philip J - Van Heezik, Yolanda - Cooper, John
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 3
    Date: 1991
    Page Range: 480--485
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-